2 things, this may be long...
1. could the very atoms of the living metal have small parts of a teleporting device attached onto them, i mean these little devices would have to be so small they could fit on an atom, and when a signifigant number of them are within a very small area it allows teleportation??? i dunno this is pretty unlikely, but hey if they can make microscopic repair organisms its possible.
2. Does any one know about zero force?
1. As I see it, the necron teleportation is, as somebody else stated, based on a distant device teleporting the necron away. Every atom in the Necron might be marked somehow, and when the device inside the necron which sends the "alive" signal (which does so that the necron isn't teleported home) gets damaged or is turned off by the necron, it will teleport back to the tomb world. So, blocking off the teleportation signal wouldn't be any good, as the effect would just be to teleport the necrons away (actually, that would remove the treath...My friends, I have found the way to eliminate the Necrontyr treath. It is simply to avoid them. Now, we need something that can block their signals...). If we would want to capture a necron, we would need to decrypt it's signal and actually reproducing it, so that even thought the necron stops his, a similar signal will be sent out...
2. This zero force thing you talk about. No, I haven't heard about it, but the effect reminds me of matter/antimatter collisions. A collision between particle and antiparticle transfers all material into energy, actually imploding them (As a side notice, a gramme or two of antimatter would have the same effect as a Hiroshima nuke, if it wasn't a hydrogen bomb...kaboom Necron army...of course, we would only remove a few grammes of necron, but we would send the whole force back to the tomb world...). The only way of actually making a controlled implosion of matter/antimatter would be to make a 100% vacuumed container of matter, which was also a powerful electromagnet, effectively holding the antimatter in the exact center of the container.
As for getting antimatter, well, according to different theories there should be just as much antimatter as matter out there in the universe. The thing is that when energy is converted to matter, it produces one particle and one antiparticle...and knowing that there is a lot of matter in the universe, there must be a lot of antimatter too...
As for destroying the necrons, I do agree that sending them into warpspace would destroy them. This Geller field, what would happen if it failed? Would the matter be sent out of the Immaterium, or destroyed? if the last happened, well, Necrons would be easy targets...personall
y, I believe in creating larger weapons to fight them than wraith- and d-cannons.
Now: the Webway. This is, as someone pointed out, not the warp. However, it shares a lot with it. The closest any mon-keigh has come to understand it, is that it is in the warp, yet still not...as is stated somewhere in the Codex Eldar...(last pages). As I see it, it is partly in real-space and partly in the warp, yet not really in any of them...
